Wrong redirect

with successfull I installed ISPconfig on Amazon AMI.
I have only a problem.
I uploaded a file called "installer.php" in the root of my website.
The webpage generated from file have a button. When I click on the button after I completed the form I received error 404 because ngix webserver redirects on this page: http://mywebsite.com/installer.php/installer.php

The error isn't in the file because I have tried it on another hosting and it works.